Papers by Author: Ji Xian Gong

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Authors: Wei Ling Zhang, Jian Fei Zhang, Zheng Li, Ji Xian Gong, Hui Ping Yang, Ke Ke Shang
Abstract: Biomodification of polyester film is a new field which can improve the surface property of material whithout environmental pollution and high energy consumption. Bacillus B-F which was isolated from waste water could biodegrade terephthalic acid. It was fermented and the broth was concentrated and used for surface process of polyester film. The modification lasted for 20 days. The surface property of the original and modified polyester film were tested. Contact angle examination showed that the hydrophilicity and surface free energy of the film was increased; XPS tests revealed the content of oxygen increased; FTIR showed that a small quantity of phenolic hydroxyl group appeared on the surface of the film; an oxygenase catalysed action might react at the surface of the film according to the degradation pathway of the simulacrum terephthalic acid.
Authors: Hui Qin Li, Ji Xian Gong, Qiu Jin Li, Zheng Li, Jian Fei Zhang, Ke Ning Chen, Zhu Xian Tang, Guo Qiang Ding, Sheng Yuan Lin
Abstract: Fabrics provide an attractive alternative for cell immobilization carrier. In this study, the relationship of weave structure of fabrics and the effects of cell immobilization was investigated. Several kinds of fabrics with different weave structure were designed and produced acting as cell immobilization carrier. Adsorptive capacity of the textile carriers with different weave structure was measured and the biodegradation rate of TA by cells absorbed on textile carriers was also investigated. It is showed that adsorptive capacity and stability was significantly affected by weave structure of fabric carriers. The result also indicated that the ability to TA degradation was also improved by cell immobilization.
Authors: Ji Xian Gong, Zheng Li, Qiu Jin Li, Jian Fei Zhang
Abstract: Evolutionary engineering is a novel whole-genome wide engineering strategy inspired by natural evolution for strain improvement. Terephthalic acid (TA) is the most important starting material for making synthetic products, especially polyester fiber and plastics. Both TA and its manufacturing wastewater show acute, chronic and molecular toxicity to organisms. In textiles manufacturing, alkali de-weighting finishing of polyester fabrics was a main resource for producing waster water containing TA. Microorganisms can hardly adapt to the high pH caused by the alkali in wastewater of alkali de-weighting process. Although the strain for TA biodegradation already have been isolated, it is necessary to develop new innovative methods of treating TA in alkali de-weighting wastewater effectively. In this investigation, evolutionary engineering was applied to improve the characterization of Bacillus strain and the high pH resistance phenotypes were obtained. The approach of selection procedure presented in this investigation may provide an attractive promising alternative for improvement of pH resistance strain.
Authors: Jia Chuan Hua, Zheng Li, Wen Xia, Ji Xian Gong, Jian Fei Zhang, Chang Sheng Qiao
Abstract: The work is aimed to investigate the suitability of poly (γ-glutamic acid) (γ-PGA) for the hydrophilic finishing of polyester fiber. γ-PGA hydrogel was successfully synthesized by a simple mixture process in the aqueous solution. A novel hydrophilic finishing agent was prepared by γ-PGA hydrogel. The rheology behavior study indicated that γ-PGA solution and hydrophilic finishing agent performed pseudoplastic fluid and approximately Newtonian behavior, respectively. The particle diameter determined that particles in hydrophilic finishing agent reached micro-nanograde. Furthermore, polyester fiber was treated with γ-PGA solution and hydrophilic finishing agent. Moisture regain was evaluated as a key performance, results shown the hydrophilicity of polyester fiber was greatly enhanced by γ-PGA finishing.
Authors: Song Kun Yao, Qiu Jin Li, Wei Zhang, Ji Xian Gong, Jian Fei Zhang
Abstract: A beads based on cellulose and the room temperature ionic liquid 1-butyl-3-methyl imidazolium chloride ([Bmim]Cl) was prepared. Regenerated cellulose beads were modified with silane, and characterized by scanning electron microscopy. Papain was immobilized on the beads used two different methods including glutaraldehyde and covalent cross-linking method. The immobilized enzyme activity of bead was determinated by BAEE (N-benzoyl- DL-arginine ethyl ester hydrochloride) determination. According to the enzyme activity and immobilization rate compared with covalent cross-linking method, glutaraldehyde cross-linking method is more suitable for amino-modified.
Authors: Ji Xian Gong, Yan Fei Ren, Hui Qin Li, Zheng Li, Qiu Jin Li, Jian Fei Zhang
Abstract: Nature provides readyanswers to scientific and technical problems and inspires us with a series of technologicalinnovations. The distribution of pigment in vivo inspired theprocess of fabric finishing. Naturalcompounds from plant waste was employed for textile processing in thisinvestigation and the method of dyeing and finishing simultaneous wasconstructed. Capacity and function of the process was evaluated through colour yield and fastness, antifungalactivity and UV –protection performance. Tawny colour was obtained in theprotein fabrics processed with the extracting solution of tea-stalk and Apocynum halm. The fastness properties of both tea and Apocynum dyed samplesare quite satisfactory for practical textile dyeing purposes, especially thewool fabrics processed with tea-stalk extracting solution. And the protein fabric samples treated with tea and Apocynum waste solutionshowed good inhibitory effect (>50%) against E.coli and S.aureus. UV protection level ofprotein fabrics were increased with the treatment by extracting solution of tea-stalkand Apocynum halm.
Authors: Wei Ling Zhang, Jian Fei Zhang, Zheng Li, Ji Xian Gong
Abstract: Terephthalic acid is one of the main contaminations released by PET processing and it's toxic to environment and animals. Useful microbe must be found out to biodegrade it. Bacillus came from waste water may be powerful to biodegrade it, so the waste water were used as the sources of bacillus. The microbe was enriched in enrichment medium first and then isolated on selective medium containing terephthalic acid as the only carbon source to get the microbe suitable for degradation. The purified microbe was used to biodegrade terephthalic acid at different temperature to find out its suitable living and degradation condition. The microbe was identified with molecule biological identification and biolog express identification. The fermentation condition of the purified microbe was studied. The enzyme activity, growth condition and degradation condition was studied. The results showed that the isolated microbe was a kind of bacillus named comamonas testosteroni. It's powerful to degrade terephthalic acid at 37 °C with the rotational speed of 200 rpm. The pH of the medium would increase during degradation of substrate. The degradation would consumed a lot of oxygen. A degradation path may be deduced.
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